改性二氧化钛膜在185nm真空紫外光下光催化降解甲苯
发布时间：2021-06-26 22:06
挥发性有机物（volatile organic compounds,VOCs）是微环境中常见的污染物,如何有效去除挥发性有机物是改善微环境空气品质的难点。光催化可以降解绝大多数VOCs,但反应速率慢、催化剂易于失活。185 nm真空紫外光（vacuum ultraviolet,VUV）催化对污染物有更高的去除速率,但会带来臭氧副产物问题。本文尝试对二氧化钛（Ti O2）进行改性,包括在Ti O2负载钯（Pd）纳米颗粒以及活性面{001}暴露率高的Ti O2,考察改性Ti O2在185 nm真空紫外光下同步催化去除甲苯及臭氧的性能,并在中试规模下评价Pd-Ti O2对低浓度甲苯的去除性能及其实际应用可行性。采用低温静电自组装方法在Ti O2膜上负载Pd纳米颗粒,研究Pd-Ti O2在VUV下同步催化分解甲苯及去除副产物臭氧的性能及其机理。Pd纳米粒子通过静电作用在Ti O2膜表面均匀沉积,浸渍时间影响Pd纳米粒子的分散度及数量密度。在浸渍时间10min获得的Pd-Ti O2因具有较小的平均粒径（3.0 nm）和较高的数量密度（6.67×1011 cm-2）,从而表现出最佳的甲苯和臭氧去除...
【文章来源】：清华大学北京市 211工程院校 985工程院校 教育部直属院校
【文章页数】：117 页
【学位级别】：博士
【文章目录】：
摘要
Abstract
Abbreviations
Chapter 1 Literature reviews and research objectives
1.1 Introduction
1.2 VOCs pollution and control technologies
1.2.1 Indoor VOCs pollution
1.2.2 VOCs control technologies
1.3 Photocatalysis for VOCs degradation
1.4 TiO_2 photocatalyst and its modification
1.4.1 Brief introduction of TiO_2 photocatalyst
1.4.2 Synthesis and modification of TiO_2
1.5 Research objectives and contents
1.5.1 Research objectives
1.5.2 Research contents
Chapter 2 Preparation of Pd-TiO_2 and their photocatalytic property
2.1 Introduction
2.2 Experimental section
2.2.1 Preparation of the Pd-TiO_2 films on the Ti sheet
2.2.2 Characterization of as-prepared catalysts
2.2.3 Evaluation of catalytic activities for toluene and ozone removal under 185 nmVUV light
2.2.4 Sampling and analysis
2.3 Results and discussions
2.3.1 Structure and morphology of Pd-TiO_2 films
2.3.2 Effect of Pd dispersion on the activity of Pd-TiO_2
2.3.3 The activity of Pd-TiO_2 over a range of toluene concentrations
2.3.4 Formation of intermediates, CO_2 and CO during toluene degradation
2.4 Chapter summary
Chapter 3 Synthesis and its photocatalytic activity of Ti O2 with dominantexposure of {001} facets
3.1 Introduction
3.2 Experimental section
3.2.1 Preparation of catalysts
3.2.2 Characterization of catalysts
3.2.3 Evaluation of activity for toluene and ozone removal
3.2.4 Sampling and analysis
3.3 Results and discussion
3.3.1 Effect of fluorine on the activity of {001}TiO_2
3.3.2 Effect of p H values on the activity of {001}TiO_2
3.3.3 Effect of Pd deposition on the activity of {001}TiO_2
3.3.4 Comparison of activities of different TiO_2 catalysts
3.4 Chapter summary
Chapter 4 Evaluation of VUV photocatalysis in a pilot scale system
4.1 Introduction
4.2 Experimental section
4.2.1 Pilot-scale photocatalytic system
4.2.2 Preparation of Pd-TiO_2 catalysts
4.2.3 Layout of Pd-TiO_2 and operation parameters
4.3 Results and discussion
4.3.1 Comparison of catalysts with different configurations
4.3.2 Performance of the pleated Pd-TiO_2 catalyst
4.3.3 Discussion
4.4 Chapter summary
Chapter 5 Conclusions and suggestions
5.1 Conclusions
5.2 Suggestions
References
Acknowledgement
Curriculum vitae
【参考文献】：
期刊论文
[1]Screening study of transition metal oxide catalysts supported on ceria-modified titania for catalytic oxidation of toluene[J]. Dan-qing YU1,Yue LIU1,Zhong-biao WU1,2(1Department of Environmental Engineering,Zhejiang University,Hangzhou 310027,China)(2Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control,Hangzhou 310027,China). Journal of Zhejiang University-Science A（Applied Physics & Engineering）. 2011(06)
[2]Photocatalytic Oxidation of Aniline in the Gas Phase Using Porous TiO2 Thin Films[J]. Fa Wenjun,Li Ying,Gong Chuqing,Zhong Jiacheng College of Chemistry and Molecule Sciences,Wuhan University,Wuhan 430072,China. Frontiers of Chemistry in China. 2006 (01)
本文编号：3252178
【文章来源】：清华大学北京市 211工程院校 985工程院校 教育部直属院校
【文章页数】：117 页
【学位级别】：博士
【文章目录】：
摘要
Abstract
Abbreviations
Chapter 1 Literature reviews and research objectives
1.1 Introduction
1.2 VOCs pollution and control technologies
1.2.1 Indoor VOCs pollution
1.2.2 VOCs control technologies
1.3 Photocatalysis for VOCs degradation
1.4 TiO_2 photocatalyst and its modification
1.4.1 Brief introduction of TiO_2 photocatalyst
1.4.2 Synthesis and modification of TiO_2
1.5 Research objectives and contents
1.5.1 Research objectives
1.5.2 Research contents
Chapter 2 Preparation of Pd-TiO_2 and their photocatalytic property
2.1 Introduction
2.2 Experimental section
2.2.1 Preparation of the Pd-TiO_2 films on the Ti sheet
2.2.2 Characterization of as-prepared catalysts
2.2.3 Evaluation of catalytic activities for toluene and ozone removal under 185 nmVUV light
2.2.4 Sampling and analysis
2.3 Results and discussions
2.3.1 Structure and morphology of Pd-TiO_2 films
2.3.2 Effect of Pd dispersion on the activity of Pd-TiO_2
2.3.3 The activity of Pd-TiO_2 over a range of toluene concentrations
2.3.4 Formation of intermediates, CO_2 and CO during toluene degradation
2.4 Chapter summary
Chapter 3 Synthesis and its photocatalytic activity of Ti O2 with dominantexposure of {001} facets
3.1 Introduction
3.2 Experimental section
3.2.1 Preparation of catalysts
3.2.2 Characterization of catalysts
3.2.3 Evaluation of activity for toluene and ozone removal
3.2.4 Sampling and analysis
3.3 Results and discussion
3.3.1 Effect of fluorine on the activity of {001}TiO_2
3.3.2 Effect of p H values on the activity of {001}TiO_2
3.3.3 Effect of Pd deposition on the activity of {001}TiO_2
3.3.4 Comparison of activities of different TiO_2 catalysts
3.4 Chapter summary
Chapter 4 Evaluation of VUV photocatalysis in a pilot scale system
4.1 Introduction
4.2 Experimental section
4.2.1 Pilot-scale photocatalytic system
4.2.2 Preparation of Pd-TiO_2 catalysts
4.2.3 Layout of Pd-TiO_2 and operation parameters
4.3 Results and discussion
4.3.1 Comparison of catalysts with different configurations
4.3.2 Performance of the pleated Pd-TiO_2 catalyst
4.3.3 Discussion
4.4 Chapter summary
Chapter 5 Conclusions and suggestions
5.1 Conclusions
5.2 Suggestions
References
Acknowledgement
Curriculum vitae
【参考文献】：
期刊论文
[1]Screening study of transition metal oxide catalysts supported on ceria-modified titania for catalytic oxidation of toluene[J]. Dan-qing YU1,Yue LIU1,Zhong-biao WU1,2(1Department of Environmental Engineering,Zhejiang University,Hangzhou 310027,China)(2Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control,Hangzhou 310027,China). Journal of Zhejiang University-Science A（Applied Physics & Engineering）. 2011(06)
[2]Photocatalytic Oxidation of Aniline in the Gas Phase Using Porous TiO2 Thin Films[J]. Fa Wenjun,Li Ying,Gong Chuqing,Zhong Jiacheng College of Chemistry and Molecule Sciences,Wuhan University,Wuhan 430072,China. Frontiers of Chemistry in China. 2006 (01)
本文编号：3252178
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